Just a quick note to all people who now generate maps: get a nightly version as of today or newer and thanks to Rubidium the maps can contain automatically generated rivers. The NewGame menu has a new option which allows to set the amount of rivers on a map – though the actual generated amount of rivers may vary depending on the roughness of the terrain.

Be careful with the rivers though – they don’t heal themselves and you can’t build them ingame 😉